I wasn't going to do it this year but signed up at the last second. I road it last year, fun event. I took video of the ride but haven't edited it - maybe I'll do that today. What pace did you sign up for? Where are you from?
I am pretty sure I signed up for 17mph; I think that is realistic if I continue training as I have been, and get in a couple good groups.
I'm in Cambridge, MA... do most of my training west of the city (some out towards needham/dover, some out towards Hanscom). I'm going to be working in Milton soon, so I'll be able to train in the Blue Hills easily before or after work.
Anyway, this makes getting on the trainer for a couple hours a bit more tolerable!